A tent stove jack is a hole for inserting woodstove pipes in a hot tent wall. Considering the actual usage scenario, the stove jack cloth must be fireproof. Generally, the producer sews a small piece of the fireproof strip around the tent stove jackhole, or sews a piece of fireproof cloth and dig a circular hole in it. Individual producers sew a fireproof cloth with a circle hole meanwhile sew a fireproof strip around the circle hole. The diameter of the stove jack hole is usually 5-8 inches, which can be better matched with most stove pipes. https://www.pomoly.com/What-is-a-tent-st...63602.html